Helmet strap buckle



FIG. 1 is a front elevation view of a helmet strap buckle, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a front, bottom, left side perspective view thereof; and,

FIG. 8 is a rear, top, left side perspective view thereof. 

The ornamental design for a helmet strap buckle, as shown and described. 